JP2876127B2 - Dental technician pin and model making method using it - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a dental technician, and more particularly, to a dental technician pin for producing a prosthesis without lining (lining) a metal material and a model production using the same. It is about the method.

[Conventional technology]

Conventionally, there are two types of dental prostheses that have been lined with a metal material and those that do not use a metal material at all. Many are used. However, in recent years, porcelains having high strength have been developed, and esthetics have become extremely important in crown restoration prostheses. Therefore, prostheses that do not line with metal materials are frequently used again. It has become.

The production of the prosthesis without lining the metal material is performed using a model. A conventional model manufacturing method used for this will be described in detail. First, a refractory model material is poured into an impression material molded from a patient's dentition, and a refractory model (primary model) 1 as shown in FIG.
make. A dividing line 2 is inserted into the refractory model 1 in order to obtain a dividing mold for each tooth.

Approximately 1/3 from below model 1
Insert a V-shaped groove up to the point, then make a frame with gypsum, then take out and put the groove in about half to 1/3 length so that it is easy to divide the side using a disk etc., then by hand Then, as shown in FIG. 7, the position is reproducible by the mutual holding force due to the unevenness and the curved shape formed on the side surfaces of the divided models 3 as shown in FIG. That is, the divided models 3 divided into each other can be reproduced in their original positions without using pins for position maintenance such as dowel pins. However, in this case, the porcelain printing method is as follows. Then, porcelain is laid in accordance with the ordinary method, and baked for each model by porcelain furnace. Thereafter, until the model 3 is maintained in a stable state and the prosthesis 4 is in a functional form, the laying and firing is performed. It was by a method that was repeated.

[Problems of the prior art]

However, in the method using no dowel pin as described above, since the function of maintaining the model at a predetermined position is uncertain, the manufactured prosthesis often becomes incompatible when mounted on a patient. Since this is not lined with metal material, only the prosthesis cannot be fired, so the entire model must be fired. As a result, when a conventional metal dowel pin is used, the dowel pin melts. Metal dowel pins cannot be used because the porcelain material that has been laid or laid up and baked is oxidized, and the mutual holding power on the divided surfaces and the positioning of the outer frame with the gypsum material when the model is divided Due to the nature of the prosthesis, if the model is chipped or rubbed, the restoration of the position becomes inaccurate, and the resulting prosthesis often has poor compatibility.

[Means for solving the problem]

In view of the above circumstances, in place of the metal dowel pin, with a dental technician pin made of a fire-resistant ceramic material, in order to reset the split mold to a predetermined position, the pin is erected at a predetermined position of the fire-resistant model, A secondary model is created using an impression material so as to surround the entire pin. Further, in order to increase the strength after being surrounded by the impression material, the portion of the impression material is buried in the gypsum material, and then the split mold of the primary model is separated and removed. A prosthesis can be obtained by repeating building and firing on the split mold.

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIGS. 1 (a) and 1 (b) show dental technology pins (hereinafter abbreviated as pins) P, which are fire-resistant (heat-resistant).
It is formed of a ceramic material such as alumina, zirconia, mullite, forsterite, or silicon nitride having a property to form a tapered rod-shaped body, and has at least one flat surface in the longitudinal direction. That is, in the pin P shown in FIG. 1 (b), notches P ₁ as sitting prevention sinking projecting symmetrically to the upper part in quadrangular prism is formed integrally. Further, in FIG. (B) is a tapered shape, and is formed in a rod-like body having a substantially semi-cylindrical having a plane f in the longitudinal direction, and which was equipped with a disc-shaped notches P ₂ There, the split of the pin P is described below, or to form a peripheral groove P ₃ in the upper part to provide a more strong binding strength, or warts shaped protrusion (not shown) such as those plural number It may be. The cross-sectional shape of the rod-shaped body is not limited to the above shape, and may be a triangle, a hexagon, or the like. In short, when implanted in a dental model, the pin P itself does not rotate,
It is necessary that the cross-sectional shape of the pin P be something other than a circle in order to accurately determine the position when reassembling and restoring the prosthesis after the build-up and firing steps in the split type to the original primary model. In addition, since this pin P is formed of a ceramic material such as alumina, it has characteristics such as high-temperature fire resistance and small thermal expansion. Therefore, porcelain is built up, and at a high temperature of 900 to 1000 ° C. Even when the firing step is repeated, it is possible to return to the original pin hole without being melted or deformed.

Next, a method of manufacturing a model using the pins P will be described.

First, a refractory material is poured into a tooth mold taken with an impression material from the mouth of a patient, and a refractory model 1 as shown in FIG.
make. After that, put the dividing line 2 and fireproof model 1
The above-mentioned pins P as shown in FIG. 1 are implanted on the bottom surface 1a of the first model to obtain a primary model 10 having the pins P as shown in FIG. Next, the pins P are surrounded by the impression material S so as to surround the whole of the plurality of pins P so as to have a shape shown in FIG. Next, the portion covered with the impression material S as shown in FIG. 5 is hardened while being buried in the slurry-like plaster material K, thereby increasing the strength and accurately stabilizing the positional relationship between the model and the pin P. The planted divided model 10 is taken out, and each tooth is separated by cutting with a rotating disk or the like. The process of laying porcelain on the divided mold for each tooth taken out and firing in a furnace is repeated to obtain a prosthesis having a desired color and shape.

〔The invention's effect〕

As described above, according to the present invention, the pin can be fired together with the refractory model material by making the material of the pin a ceramic having high fire resistance and having a cross-sectional shape other than a circle. It is possible to use the traditional split-subposition method, such as accurate positioning at the time, and to use the impression material in the secondary model to parallelize the pin planting seen in the past. Because of the lack of the stone, it is possible to easily and accurately create the paper without being stuck or missing the plaster. Thereafter, the tertiary model is covered with gypsum to increase the strength, and furthermore, it is possible to prevent deformation of the impression material by secure fixing. As a result, a dental prosthesis having good compatibility can be easily created. Further, by covering the tertiary model with gypsum, it is possible to mount the tertiary model on an articulator, and the occlusal relationship with an opposing tooth necessary for producing an inlay, an onlay, a full crown or the like can be easily obtained.

[Brief description of the drawings]

1 (a) and 1 (b) are perspective views of a dental technician pin according to an embodiment of the present invention, and FIGS. 2 to 6 are diagrams for explaining a method of manufacturing a dental technic model according to an embodiment of the present invention. FIG. 7 is a perspective view showing a part of a divided model according to a conventional example. 1: Fireproof model, 2: Split line 4: Prosthesis, P: Pin for dental technician K: Plaster, S: Impression material

Claims (2)

(57) [Claims] 1. A rod made of a ceramic material such as aluminum, zirconia, mullite, forsterite, silicon nitride, etc., has a tapered shape, has at least one flat surface in the longitudinal direction of the rod, and serves as a seat for preventing sinking. A dental technician pin formed integrally with a notch, 2. A method for producing a fire-resistant model used in a process for producing a dental prosthesis such as a porcelain jacket crown, a porcelain veneer, and a porcelain inlay, which is not lined with a metal material. A plurality of dental technology pins made of refractory material are planted on the refractory model
A method of manufacturing a model for dental technicians, comprising: surrounding the pin with an impression material, burying the portion of the impression material in a gypsum material, and after curing, separating and removing a split mold of the primary model.